Back-pedaling brake.



No. 635,704. Pat'ented Oct. 24, I399.

' N WALLEBICH BACK PEDALING BRAKE.

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BACK PEDALING BRAKE.

(Application filed Dec. 30, 1897.)

N0. 635,704. Patented Oct. 24, I899.

(No Model.) 2 shuts-sheet 2.

7 I I n I Minn wnuzsszs: INVENTOR,

ATTORNEY.

NICHOLAS WVALLERIOH, OF FORT \VORTH, TEXAS.

BACK-PEDALING BRAKE.

SPECIFICATION forming part of Letters Patent No. 635,704, dated October 24, 1899.

Application filed December 30, 1897. Serial No. 664,640%. (No model.)

To all whom it may concern:

Be it known that I, NICHOLAS WALLEnIoH, a citizen of the United States, residing at Fort Worth, Texas, have invented a new and Improved Brake and Coasting Sprocket-WVheel for Velocipedes, of which the following is a specification.

My invention relates to improvements in. sprocket-wheels; and the object is to construct a combined coasting and driving wheel with brake attachments for stopping velocipedes, whether coasting or whether the velocipede is being propelled by some kind of motive power, by which a person can coast by simply stopping the motion of the pedals and holding the pedals still with the feet; and I accomplish this object by the combination of the mechanism hereinafter fully described and more particularly pointed out in the claims.

Reference is had to the accompanying drawings, forming a part of this specification.

Figure 1 is a side elevation of a sprocketwheel and a pedal-crank, showing my attachments. Fig. 2 is a side elevation of the Wheel, showing parts of one of the flanges broken away to expose the spring-pressed dogs, this View being opposite that of Fig. 1. Fig. 3 is a sectional view of the wheel, the pedal-crank being shown in broken front elevation and the pedal being turned to show the top. Fig. 4 is a side elevation of a pedal-crank and link- 7 rod, with the rack, and cog-wheel, with the flange cut away. Fig. 5 is a perspective of the clip for holding said rack in alinement with said cog-wheel. Fig. 6 is a cross-section of said clip. Fig. 7 shows a variation in the friction-brake. Fig. 8 shows an irregular bolt-head. Fig. 9 is a horizontal View of the brake-rod, illustrating the rack and the flange on this rod.

Similar characters of reference indicate the same parts throughout the several views.

The invention consists in certain appliances attached to a sprocket-wheel and in adapting the sprocket-wheel to purposes set forth.

In the drawings awheel is illustrated which is constructed in two sections A and B, section 13 being adapted to run within section A. WVheel A has an annular flange a integral therewith and a similar flange 6 bolted or riveted to the opposite side of wheel A. These flanges make an annular space for wheel B and hold said wheel concentrically within wheel A and constitute a bearing for a brakeband. These flanges areL-shaped in crosssection. The wheel-sections are locked together, and the structure forms for driving purposes one wheel. The sections are locked together by means of the dogs 0 c c, which are substantiallytriangular and are inserted in recesses cut in the outer part of inner section B. The springs cl d cl aid in making the dogs 0 c c engage the outer section A promptly. These dogs are pivotally mounted in said recesses, and the side next to wheel A is curved, and the sides in which springs d d d are inserted must be longer than the other straight sides. When wheel B is driven in the direc-- tion of the arrows, the cams engage wheel A by reason of the differences in the length of the sides, as specified. The braking mechanism consists of a band D, which is attached to an arm R,mounted on wheel B by means of bolt 9, and also attached to a bell cranklever E by means of bolt h. LeverE is pivotally connected to a rod F, which has a rack G integral with the lower end thereof, and is engaged by a cog-wheel h, mounted on the pedal next to the pedal-crank. One of the teeth of rack G is pivoted in a recess cut in said rod. This tooth G stands normally in the position shown in Fig. at and is held in this position by a spring H, which is preferably a spiral spring. Then the bicycle is being propelled, this tooth G by reason of its pivotal mounting and the spring H allows the teeth of cog h to pass by pressingthe tooth up. In Fig. 4. the cog it" turns in the direction opposite to that of the hands of a clock when the velocipede is being propelled.

If it is desired to stop the velocipede gradually,reverse the motion of the pedal slightly. Cog 71 will then engage rack G, and this operation will pull down on rod F, and thus cause lever E to clamp flange a with the brake-band D. Fig. 1 shows the rack Gr and cog h in dotted outline, the cog h being covered by a flange 19. In Fig. 4 this flange is cut away. Fig. 3 shows the position of the flangep. The rod F is provided with a flange 19'. (Shown in Fig. 4:.) Flange p comes against the pedalshaft and constitutes a bearing for the rack G. This flange 1) coming against the pedalshaft and the back of rack G resting against guide N constitutes a brace or bearing for rod F. This will give a spring to red F when drawing down on lever E. A clip M is mounted 011 the lower end of the pedal-crank Q and covers the bottom, sides, and back of the lower end of the crank. The part M ofthis clip is held in place by the nut on the end of the pedal-shaft. This clip has a guide N for the rod F in its upward and downward motion. Instead of using this clip the guide Ncan be made integral with the lower end of the pedalcrank, as illustrated in Fig. 3.

There will be wear between the frictionband D and the flange a. I place a bolt '0 in wheel B, with a head having sides of unequal distance from the center of the bolt. The side having the shortest distance from the center of the bolt is placed next to arm R. As the clutch and the flange wear, the next side is turned next to the arm 13 and so on. The bolt is secured by a nut on the opposite side of the wheel B.

The variation shown in Fig. 7 consists in substituting for band D brake-shoes which are attached to lever E for simply gripping the flange a.

The operation may be described as follows: When it is desired to coast, sufficient speed having been obtained, stop pedaling and hold the pedals still with the feet. The dogs will release wheel A and leave this wheel free to revolve. WVhen it is necessary to brake, back-pedal slightly. This will cause cog h to engage rack G. This will draw on red F and pull the long end of the lever E and so press band D on flange a The braking may be done at any point of the circumference of the circle made by the pedal. The propelling is done in the same way as in other wheels. Modifications in the manner of attaching wheel 13 to pedal-shafts are to be made, so that my invention can be attached to any style of velocipedes.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is 1 1. In a brake and coasting-wheel the combinations of two sections forming said wheel,

one section running within the other, the onter'section being provided with circular L- shaped flanges forming an annular space therein, the inner section being adapted to run in said space, a bell-crank lever and a brake-band mounted on said inner section, said band being attached to said lever, and adapted to engage one of said flanges, triangular spring-pressed dogs having pivotal bearings in said inner section for locking saidsections together for propelling purposes, a link-rod pivoted on said lever, and a clip mounted on the lower end of the pedal-crank adapted to guide said rod, said rod having a rack integral with the lower end thereof, a cog being rigid with the pedal and normally out of engagement with said rack, but adapted to be engaged therewith for braking purposes, and a tooth pivoted 011 said link-rod and adapted to engage said cog and cause the same to engage said rack.

2. In a sprocketwheel constructed in two sections capable of independent rotation provided with flanges projecting from the sides thereof and a brake-band for engaging one of said flanges; means for operating said band consisting of a lever pivotally mounted on the inner section of said wheel, a link-rod pivotally connected to said lever and provided with a rack integral therewith and a tooth pivoted thereon and forming a part of said rack, a pedal having a cog mounted thereon adapted to engage said rack, and a clip for holding said rack in mesh with said co 3. In a sprocket-wheel constructed in two sections capable of independent rotation provided with flanges projecting from the outer section and a brake-band for engaging one of said flanges mounted on the inner section; means for operating said band and means for taking up the wear of said band and the flange engaged by said band consisting of an irregular bolt-head adapted to press against one end of said band.

NICHOLAS \VALLERIOI-I.

Witnesses FRANK D. BOYD, JOHN A. BOYD. 

